Radio wave control switch



Dec. 27, 1927. 1,653,753

J. 5. WHEELAND RADIO WAVE CONTROL SWITCH Filed Jan.21. 192s (L -H5 E1130, 4

' [N VE/VTDH J 5 WEEZAAW Elk 5 Patented Dec. 27, 1927.

JESSE S. WHEELAND, OF SAN FRANCISCQOALIFORN-IA.

RADIO WAVE CONTROL SWITCH.

Application filed January This invention relates to improvements in .radio receiving sets but more particularly to a switch or circuit closing device which Will operate to control the tuning of the receiving set.

An object of'the invention is to provide a radio wave length control switch of the character described which is of simple and inexpensive form, small, compact and subject to ready and easy installation in a radio receiving set.

Another object of the invention is to provide a control switch of the character described by'means of which one or a plurality of tuning elements of a radio receiving circuit may be effectively controlled in the tuning operation.

lVith the above mentioned and other objects in view, the invention consists in the novel construction and combination of parts hereinafter described, illustrated in the accompanying drawing, and set forth in the claim hereto appended, it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claim may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Referring to the drawing:

Fig. 1 represents a vertical sectional view of the switch of this invention as it would appear when mounted in position of use.

Fig. 2 represents a front elevation of the switch, the shaft being shown in section.

Fig. 3 represents a rear elevation of the switch.

Fig. 4 represents a diagrammatic view of a part of a radio receiving circuit showing the manner of incorporating therewith the switch of this invention.

The embodiment of the invention illus trated in the accompanying drawing comprises a tubular body portion 1 of insulation material, having a wall 2 closing one end thereof, and being open on its other end. On the periphery of the body portion are a plurality of contact members, in this instance nine, being designated 3, 4, 5, 6, 7, 8, 9, 10 and 11. These contact members-are extended through the body and on their inner ends have electrical conductors 12, 13, 14, 15, 16, 17, 19, 19 and 20, electrically joined thereto. These conductors extend into the body through a recess or opening 21 cut in the lower side of the body and by 21, 1926; Serial No. 82,694.

this arrangement the body-is subject'to being placed against the rear face of-and secured on a panel 22 by means of screws'23'.

Extending through an opening 24 provided in the wall 2 is a shaft 25 upon which a disk 26 of insulation material is fixed. A suitablewasher 27 is mounted on the shaft between the wall 2 and inner face of said disk. The shaft is squared as at 28 on its outer end and extends through an opening of similar shape in the disk. A wear plate 29 is fastened 011 the out-er face of the disk. A pin 30 serves to hold the disk upon the squared portion of the shaft.

A pin 30 is carried by the disk 26 and slidably engages in an arcuate slot 31' formed in the wall 2 of the body. This pin and slot arrangement limits the movement of the rotary element of the switch such that the contact members are moved in just the desired'range' to cooperate; The disk 26 supports a plurality of spaced resilient contact members designated 31, 32 and 33, the upper portions of which members are of arcuate platelike form and are adapted to engage with the contact members 3 to 11 inclusive. Each plate is of such size as to be capable of simultaneous engagement with two of said contact members.

On the outer end of the shaft a suitable turning knob 34 is removably mounted and an expansion spring 35 is interposed between this knob and the outer face of the panel 22.

The switch of the invention is installed in a receiving set as shown in Fig. 4. The secondary 36 of the tuning coils 37 is tapped bet-ween its ends by the conductor 14 which leads to the contact member 5. The conductor 12 connected with one terminal of the secondary, leads to the contact member 3. The conductor 13 leading from the contact member 4 is connected with the grid and fil ament circuit as at 38. In practice this conductor 13 is connected to the part of the condenser which is connected with the filament circuit. The three contacts 6, 7 and 8 and their conductors 15, 16 and 17 are adaptable for connection with the secondary coil such as would be used where two or more tubes are employed in the radio receiving circuit and this is true of the contact mem' bers 9, 10 and 11. The switch as shown is adapted for use in connection with three coils and will operate to simultaneously cut in and out all the secondary coils.

As shown in Fig. 4 the movable contact member 81 is in its normal position as well as are the other contactmembers and this contact member establishes a connection be tween the contacts 3 and 4. and conductors l2 and 13. This brings into the circuit the entire secondary coil. When the switch is turned to the right, the contact member 31 is moved correspondingly and then engages contact members 4: and but is disengaged from the contact member 3. \Vhen in this position only a part, for example one halt. of the secondary coil is connected in the circuit. In case all of the units of the switch are connected into a receiving ciruit employing the three secondary coils the action oi? cutting in and outportions of all the coils is simultaneous. While I have shown but one unit of the switch as applied to a radio receiving; circuit shown in Fig. i, the other units will be applied in the same manner as the one shown and it is thought unnecessary to illustrate such an arrangement. It will thus be seen that by incorporation of the switch of this invention in a radio receiving set, the tuning of the set may be regulated to more elfectively andselectivcly receive signals over a greater band of .wave lengths than would be possible without the switch of this invention. It is obvious that while I have shown but three units of the switch,

it can be made up of more units as desired but I find that in the ordinary five tube receiving set, the three unit switch of the type shown provides for the necessary tuning control.

I claim:

A switch for radio receiving sets compris ing a hollow cylindrical body of insulation material, a plurality of spaced contact members exposed on the periphery and on the in side of the body, a shaft rotatahly supported upon the body. a disk of: insulation material fixed to and adapted to rotate with the shaft and a plurality of contact members fixed to the disk, each of the last named including arcuate portions adapted to sin'iultaneously engage at least two of said first named con tact members at all times and other portions secured to the outer side of said disk, said arcuate portions being arranged such that on rotation of the shaft they will move from engagement of one plurality of first named contact members into engagement with all-- other plurality of the first named contact members and stop means for limiting the movement of said contact members, said body having" a peripheral opening for reccp' tion of electrical conductors.

JESSE S. WHEELAND, 

